diff options
Diffstat (limited to 'libparc/parc/algol/parc_Hash.c')
-rwxr-xr-x | libparc/parc/algol/parc_Hash.c | 144 |
1 files changed, 0 insertions, 144 deletions
diff --git a/libparc/parc/algol/parc_Hash.c b/libparc/parc/algol/parc_Hash.c deleted file mode 100755 index 1884c74c..00000000 --- a/libparc/parc/algol/parc_Hash.c +++ /dev/null @@ -1,144 +0,0 @@ -/* - * Copyright (c) 2017 Cisco and/or its affiliates. - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at: - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -/** - * This hash is based on FNV-1a, using different lengths. Please see the FNV-1a - * website for details on the algorithm: http://www.isthe.com/chongo/tech/comp/fnv - * - */ -#include <config.h> - -#include <stdint.h> -#include <unistd.h> - -#include <parc/algol/parc_Hash.h> -#include <parc/algol/parc_Object.h> - -struct parc_hash_32bits { - uint32_t accumulator; -}; - -parcObject_ExtendPARCObject(PARCHash32Bits, NULL, NULL, NULL, NULL, NULL, NULL, NULL); - -PARCHash32Bits * -parcHash32Bits_Create(void) -{ - PARCHash32Bits *result = parcObject_CreateInstance(PARCHash32Bits); - if (result != NULL) { - result->accumulator = 0; - } - - return result; -} - -PARCHash32Bits * -parcHash32Bits_Update(PARCHash32Bits *hash, const void *data, size_t length) -{ - hash->accumulator = parcHash32_Data_Cumulative(data, length, hash->accumulator); - return hash; -} - -PARCHash32Bits * -parcHash32Bits_UpdateUint32(PARCHash32Bits *hash, uint32_t value) -{ - hash->accumulator = parcHash32_Data_Cumulative(&value, sizeof(value), hash->accumulator); - return hash; -} - -uint32_t -parcHash32Bits_Hash(PARCHash32Bits *hash) -{ - return hash->accumulator; -} - -parcObject_ImplementAcquire(parcHash32Bits, PARCHash32Bits); - -parcObject_ImplementRelease(parcHash32Bits, PARCHash32Bits); - -/* - * Based on 64-bit FNV-1a - */ -uint64_t -parcHash64_Data(const void *data, size_t len) -{ - // Standard FNV 64-bit offset: see http://www.isthe.com/chongo/tech/comp/fnv/#FNV-param - const uint64_t fnv1a_offset = 0xCBF29CE484222325ULL; - return parcHash64_Data_Cumulative(data, len, fnv1a_offset); -} - -uint64_t -parcHash64_Data_Cumulative(const void *data, size_t len, uint64_t lastValue) -{ - // Standard FNV 64-bit prime: see http://www.isthe.com/chongo/tech/comp/fnv/#FNV-param - const uint64_t fnv1a_prime = 0x00000100000001B3ULL; - uint64_t hash = lastValue; - const char *chardata = data; - - for (size_t i = 0; i < len; i++) { - hash = hash ^ chardata[i]; - hash = hash * fnv1a_prime; - } - - return hash; -} - -uint64_t -parcHash64_Int64(uint64_t int64) -{ - return parcHash64_Data(&int64, sizeof(uint64_t)); -} - -uint64_t -parcHash64_Int32(uint32_t int32) -{ - return parcHash64_Data(&int32, sizeof(uint32_t)); -} - -uint32_t -parcHash32_Data(const void *data, size_t len) -{ - // Standard FNV 32-bit offset: see http://www.isthe.com/chongo/tech/comp/fnv/#FNV-param - const uint32_t fnv1a_offset = 0x811C9DC5; - return parcHash32_Data_Cumulative(data, len, fnv1a_offset); -} - -uint32_t -parcHash32_Data_Cumulative(const void *data, size_t len, uint32_t lastValue) -{ - // Standard FNV 32-bit prime: see http://www.isthe.com/chongo/tech/comp/fnv/#FNV-param - const uint32_t fnv1a_prime = 0x01000193; - uint32_t hash = lastValue; - - const char *chardata = data; - - for (size_t i = 0; i < len; i++) { - hash = hash ^ chardata[i]; - hash = hash * fnv1a_prime; - } - - return hash; -} - -uint32_t -parcHash32_Int64(uint64_t int64) -{ - return parcHash32_Data(&int64, sizeof(uint64_t)); -} - -uint32_t -parcHash32_Int32(uint32_t int32) -{ - return parcHash32_Data(&int32, sizeof(uint32_t)); -} |